Most charging and battery issues are simple to resolve and don't indicate a fault with your battery or charger. Gen2.5 batteries use a smart Battery Management System (BMS) and communicates with the smart charger before charging begins. This communication allows the battery and charger to perform safety checks before charging.

This guide covers the most common charging issues, including charging interruptions, charger status lights, final charging percentage and battery state-of-charge readings.

Charger Isn't Charging The Battery

The 43V charger is a smart charger that communicates with the battery's Battery Management System (BMS) before charging begins. This "handshake" is a normal safety feature.

Occasionally, if charging is interrupted (for example, the charger is unplugged while charging), the charger may not immediately restart when plugged back in.

Symptoms

• Charger remains solid green.
• Battery does not begin charging.
• Fan does not start.
• Charger appears to have finished charging when it hasn't.

Solution

1. Disconnect the charger from power.
2. Wait 10–15 seconds until:
   • the charger light turns completely off
   • you hear the internal relay click.
3. Reconnect the charger to power.
4. Allow the charger and battery a few seconds to complete their handshake.
5. Charging should begin normally.

When charging starts correctly you will notice:

• the charging indicator begins flashing
• the charger fan starts running.

Tip: Around 99% of charging issues are resolved by fully power cycling the charger before reconnecting it.

Charger Flashing Red and Green

A flashing red and green indicator typically means charging was interrupted unexpectedly, such as unplugging the charger while it was actively charging.

This is simply a charger status indication and is easily resolved.

To reset:

1. Unplug the charger.
2. Wait until all lights have turned off.
3. Plug the charger back in.

The charger will reconnect to the battery and resume charging normally.

Why Won't My Battery Top Up the Last 1–2%?

Gen2.5 batteries use intelligent charging logic.

If your battery is already very close to full, the charger may determine that the charging cycle has already been completed and may not restart for the final 1–2%.

This is completely normal.

Once the battery reaches approximately 50V, it is effectively fully charged. Although the battery can reach around 50.4V, the additional runtime gained is only a matter of seconds and is not worth repeatedly attempting to achieve.

If you're unsure whether charging has completed:

1. Unplug the charger.
2. Wait for it to power down.
3. Plug it back in.

If charging resumes, the battery will top itself up. If not, the battery is already considered fully charged.

Battery Not Charging Beyond 85%

Some early-release Gen2.5 chargers may prevent the battery from charging beyond approximately 75%-85%.

This is a charger firmware issue and can be resolved with a firmware update.

If your battery consistently stops charging at around 85%:

1. Contact the Foil Drive Support Team.
2. Send a video showing the battery, charger and charging behaviour, including the charger indicator lights.
3. Our support team will assess the issue and determine the most appropriate resolution based on your location.

Depending on your location and circumstances, the resolution may be:

• A replacement charger being sent to you, with your current charger returned to a Foil Drive service centre for a firmware update.
• Your existing charger being updated with the latest firmware and returned to you.

Do not assume the battery is faulty if it will not charge beyond 85%. Early-release chargers affected by this issue can be resolved through a charger firmware update.

Foil Drive Support will assess each case individually and confirm the appropriate process for your location.

Check You're Using the Correct Charge Mode

If charging stops immediately after starting, check whether you've selected Storage Charge.

Storage Charge will stop automatically once the battery reaches the correct storage voltage.

If your battery is already above storage level, charging won't begin.

This is normal behaviour.

Still Having Charging Issues?

If your Gen2.5 battery or 43V charger is still not operating correctly after completing the troubleshooting steps above, contact Foil Drive Support for assistance.